.left{
    background-color: #BCBCBC;
    width: 240px;
    height: 100vh;
    float: left;
}
.left .title{
    width: 240px;
    height:72px;
    font-size: 32px;
    line-height: 72px;
    text-align: center;
    color: black;
    margin: 0;
    font-weight: 900;
    background-color: #7F7F7F;
}
.left .item{
    width: 240px;
    height: 48px;
    line-height: 48px;
    font-size: 24px;
    margin: 0;
    text-align: center;
    color: #222;
    cursor: pointer;
}
.left .item:hover{
    background-color: #fff2;
}
.right{
    width: calc( 100vw - 240px );
    height: 100vh;
    float: right;
    margin: 0;
    border: 0;
    padding: 0;
}
.right .top{
    height: 72px;
    width: calc( 100vw - 240px );
    background-color: #BCBCBC;
    border: 0;
    margin: 0;
    padding: 0;
}
.right .body{
    width: 100%;
    height: calc( 100vh - 72px );
    border: 0;
    margin: 0;
    padding: 0;
}